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Segment Information - Schedule of Segment Reporting Information, by Segment (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Interest expense | $ 147 | $ 142 | $ 434 | $ 422
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Interest income | 2 | 4 | 7 | 15
Interest expense | $ 8 | $ 13 | $ 29 | $ 39

X
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